Stapling hammer



May 4, 1948. N. R. LIBERT 2,441,120

STAPLING HAMMER Filed June 6, 1945 2 Sheets-Sheet 1 InVen/or.' /Vloris R .L jvber.

l www May 4, 1948,' N. R. LIBERT lSlAPLIIGr HAMMER Filed June 6, 1945 2 Sheets-Sheet 2 Patented May 4 i948 Marzo srarm@ H Norris R. Libert, ilhicago, lill., assigner to Stapling Engineers, lne., Chicago, m, a corporation oi illinois application .rune o, 1945, semi No. strate (ci. i--iai 6 Claims. i

This invention relates to an improved stapling hammer.

The primary object of the invention is to provide a stapling device to be operated after the manner of a hammer adapted to drive an individual staple with each blow struck upony the object or material to be stapled.

A further object is to provide a stapling hammer of this type in which a supply of staples are carried in a magazine and which, upon striking the surface into which the staple is to be driven,

operates to automatically feed a staple from the magazine into position and'drive'it al1 in the striking or driving operation.

A further object is to provide a stapling hammer of this type in which the power from the blow to feed and drive the staple is transmitted through a toggle mechanism which acts as a positive driving connection between the hammer head and the staple.

A further object is to provide a device of this character which is rugged in construction and relatively inexpensive to manufacture.

My invention resides in the construction, combination, and arrangement of the parts, hereinafter described, in connection with the accompanying drawings which illustrate one embodiment of the invention, and set forth in the appended claims.

Referring to the accompanying drawings,

Fig. 1 is a view in side elevation of a stapling hammer embodying the invention, a portion of the outer end of the handle being broken away to show the interior thereof;

Fig. 2 is a vertical longitudinal section of the structure shown in Fig. 1, this View being taken on the line 2--2 of Fig. 5;

Fig. 3 is a detail end view of the upper portion of the hammer head section of the device;

Fig. 4 is a detail end view of the lower portion of the hammer head section;`

Fig. 5 is a plan View of the hammer head section and a portion of the handle section of the structure shown in Fig. l;

Fig. 6 is a perspective View of the lower portion of the striking plunger guide;

Fig. 7 is a side elevation of the hammer head section witha portion of the magazine section being in section and with the staple driving parts being shown in intermediate driving position;

Fig. 8 is a View similar to Fig. 7 showing the staple driving parts in fully completed driving position;

Fig. 9 is an enlarged detail section on the line 9 9 of Fig. 7; and

Fig. 10 is a detail transverse section on the line lll-I0 of Fig. 7.

The device shown in the drawings comprises in general the hammer head section A and a magazine and handle section B. The staples C (Figs. 7, 8, and 9) for which the present device is adapted are U-shaped in section having legs or prongs C1 'which are driven into the material to be stapled and which are connected by across member C. These staples, whllemadjie-asindil placed in the magazine oi .the deidc'e Sand fed endwise to the drivingmechanism.

The handle section and hammer head-. section of the device are built upon airame .which in the present structurelsmade of a single piece of metal which is .iormed U-.shaped cnfclianneishaped in section and Lshapedin proille. The handle section B ot this frame has dpr-ight ,parallel walls Bland a'oonnecting: bottoni-wall B?. The channel is'open Vat its top thx'oughoutits length so that the strips of 'staple'smy be inserted into position to be fed the ham'mer head section. At one end.. the walls' ..B! have vertical extensions B3 which torni the' s hortle'g ci' the t. and provide a mounting for the operating parts of the hammer head secticn.

Within the vinindle section l 's a., staple guiding member D which extends the-'length of. the hat die and is channel or U- shaped insection like the frame member B. guidememberlias vertical walls D1- connecte'd, by e, bottom .wali-D? which is fastened by welding er otherwise to the bottom wall of the frame member to hold the guide in position. lhe walls Di of the guide, as shown more clearly in Flg.f.9,- .are spaced from the walls B1 of the trame to provide room for the prongs of the staples. A

The strip oi staples isplaced vin inverte'clposition in the magazieso thatthe crosseconnecting member C of th staples rideorslide along the upper edges of the guide member walls D1 so that the strip of staples .ca n,be fed to the throat in the hammer head section.

The strip of staples is fed to the hammer head section by a pusher or feedermembeii E, which is in the form ol. all inverted .0 1 .,Qhhelvshped member slidable along the upper edges vol the staple guide and-having its legs Epostioned in the spaces between the guide memberwalls D1 and the frame walls B1 in the same manner that the strip of staples is positioned.y The end of this pusher or feeder member bears against the outer end of the stripoi staples and is yieldingly acted uponto feed the st i" by the coil spring l which at its outer endg i nchored to the vouter end of the frame. The spring extends alongthe bottom portion of the stapleguide D to the head section where it isghrought. around an idler pulley 3 and its .end t fastened to'- the. feeder member so that thepull; of the. springonthe lfeeder will be in the direction tofeed thefstrip of staples to the hammer head section. Fl'haikiler pulley 3 is rotatable on a shait. 31v secured in the .upright walls of a U-shaped supporti which ispositioned within the guide member' D and securedV to the exterior of the frame B and secured by suitable means to the edges of the cover plate. The cover plate 5, on its under side, carries a strip 1 which yieldingly bears upon the top surface of the strip of staples for the purpose of conning the staples to prevent' any possibility of the strip buckling while under the pressure of the springactuated feeder member. At its inner end, this strip has a shoulder 8 formed to engage a lug 9 on the feeder member so that when the cover strip is slid lengthwise to open the magazine the feeder will be retracted to permit the insertion of a strip of staples. This connection l and 9 between the cover and the feeder member also serves as a stop when the strip of staples is within a few staples of being exhausted and thus prevents the feeder member from entering the discharge throat of the device.

Within the hammer head section is a guard member F which is positioned above the strip of staples. This guard member F consists of a plate with an upturned end F1 located at the end of the magazine section and forming a guide for the driving member. The plate F is placed above the strip or row of staples but close enough thereto to coniine the staples in the channel and prevent possible buckling or displacement of the staples out of alignment. The plate hastwo upstanding extensions or walls F2 which are secured to the inner faces of the frame wall extensions Bs by welding or otherwise to hold the plate F in position.

The head has a guide member G for the striking plunger H .which is U-shaped in cross-section and comprises the cross wall G1 and the side walls or legs G2. This guide member embraces the end of the hammer head section of the frame and its walls are positioned parallel with said frame walls and against the exterior thereof. The cross wall Gx is spaced from the end of the walls B1 of the frame suiilciently to provide a guiding space for the striking plunger H to permit said guiding plunger to move vertically or longitudinally of itself. The walls G2 of the guide have three sets of extensions. The upper extensions G3 are pivotally mounted on the walls B1 of the frame by means of a bolt I having a head at one end and a nut threaded thereon at the other end. This bolt extends through the frame walls B3 and the extensions G3 from one side of the structure to the other.

The horizontal extensions G* of the guide member have the bolt Il extending therethrough and through the walls G2 of the frame for the purpose of holding the guide member G in place for normal operation. In the event that the staples become jammed in the throat, the bolt I I can be removed and the guide member swung outwardly on the upper pivot bolt i0 and away from the end of the head so as to permit access to the throat.

The lower extensions G5 reach downwardly to the striking face J of the hammer head section which overlie the walls IBI of the hammer head section and are spaced from the ends of said walls to form the discharge throat K for the staples. This throat, as shown more particularly in Figs. 2, 7, and 8, is just sumcient for a single staple, and as the strip of staples is fed to the throat. the lugs or flanges G serve as stops to prevent more than a single staple being fed beyond the end of the magazine walls B1. The ilanges G also serve as a guide for the lower portion of the striking plunger H.

'I'he striking plunger H is in the form of a rectangular bar vertically movable in the guide G and arranged with its lower end extending beyond or below the striking face J of the head section so that when the operator swings the head section toward the object, the plunger` will contact the object irst and be moved upwardly in its guide until its lower end is substantially iiush with the striking face J of the head. At its lower end, the plunger has two wings H1 which overlie the outer face of the walls B1 of the magazine section to force or compress the layers of masection between the two wall extensions B3 and which includes a rocker lever M. The staple driving member L is a flat, hardened plate or strip of the proper width and thickness to fit the throat K of the head section. At its upper end portion this driving member has two lateral wings L1 which lie against the inner faces of the walls B3 of the frame and thereby form guides to keep the driving member in its vertical line of movement. 'I'hese wings also carry a bolt member l2 which extends through the wings and projects on either side thereof. These projecting ends of the bolt ride in vertically disposed elongated slots L2 in the walls B3 of the frame and guide the movement of the driving member and maintain the driving member in the vertical plane of its movement.

The rocker lever M is in fact comprised of two parallel pieces pivotally mounted upon the pivot bolt I0 between the upper portions of the walls B3 of the head section, but since both of these pieces are alike in construction andfunction alike, they are referred to herein as a rocker lever.

The arms M1 of this rocker bear against the upper rounded end H3 of the striking plunger. The other arms M3 of this lever form a part of the toggle mechanism. TheV other part 0f the toggle mechanism is comprised of two links Ms which are pivotally connected by means of the pivot bolt M4 to the arms M2. and by the bolt l2 to the drivingmember L.

Thus when the striking plunger is moved upwardly in the head by the force of the blow, it rocks the rocker lever M about its pivot and. through the toggle mechanism, power is transmitted to the driving member L to move this member in a direction reverse Ato that of the striking plunger; that is, the driving member L is moved downwardly in the throat and ejects the (Figs. 4 and 6) and have inturned flanges G' 'l5 staple from the throat and projects it beyond the striking face J so that it will be driven into the object, this position of the parts being shown in Fig. 8.

As soon as the blow has been struck upon the object and the staple driven therein, and the hammer lifted away for the next driving operation, the driving member L is retracted to its normal position by means of a spring I3 which is anchored at one end I4 to the guide member G and extends over the pivot bolt I0 and its other end I5 anchored to the driving member L. This spring thus retracts the driving member L and through the toggle mechanism and rocker M restores the striking plunger to its projected position in advance of the striking face J. The driving or lower end of the driving member L is retracted to a position just above the strip of staples in the magazine; and during the retraction, as the end passes the strip, the strip is fed forward to position the next staple in the throat.

It will be noted that the toggle mechanism and rocker lever provide a positive driving connection between the striking plunger and the driving member without lost motion. These parts can be so proportioned that the relative length of movement of the striking plunger and the driving member can be arranged as desired, .that is, the striking plunger can be arranged to move a greater distance than the driving member and thus increase the driving power of the driving member.

I claim:

1. In a stapling hammer of the class described, the combination of a hammer head section having a striking face, a magazine handle section terminating in a discharge throat in said head, means in the magazine section for feeding staples successively to said throat, a driving member movable in said throat to eject a staple from the throat and beyond the striking face of said head, a rocker lever in the head, a link connected with said lever and said driving member and forming therewith a toggle, and a striking plunger posi- .tioned to contact the object in advance of the striking face of the head for actuating said rocker lever.

2. In a stapling hammer of the class described, the combination of a handle section forming a magazine in which a strip of staples is moved to successively position the individual staples in discharge position and the head section having a discharge throat opening through the striking face of the head section, a staple driving member movable in said head to eject the end staple of the strip through the throat beyond the striking face and into the object, a striking plunger vertically movable in the head in parallel relation to the movement of the driving member and having the end projecting beyond the striking face of the head to contact the object in advance o! said striking face, a rocker lever in said head to bev actuated by the striking plunger, and means connecting the rocker member with the driving member to actuate the driving member.

3. In a stapllng hammer oi' the class described, the combination of a handle section forming a magazine in which a strip of staples is moved to successively position the individual staples in discharge position and the head section having a discharge -throat opening through the striking face of the head section, a staple driving member movable in said head to eject the end staple o! the strip through the throat beyond the striking face and into the object, a striking plunger vertically movable in the head in parallel relation to the 75 tract the driving member and restore the striking v plunger to normal position after each operation.

4. In a stapling hammer of the class described,

the combination of a frame channel-shaped in cross-section and having an elongated portion forming a magazine section terminating at one end in a discharge throat, means within the frame for feeding a series of staples successively to said discharge throat, an ejector and driving blade movable in said throat to project the end staple of said series beyond said frame and into the object, parallel wall extensions of said frame forming a head section, a striking plunger, a U-shaped guide member for said plunger mountedon said extensions, a rocker lever pivotallymounted between said extensions adapted to be actuated by said striking plunger, and link members connecting the rocker lever with the driving member for actuating said driving member. V

5. In a stapling hammer ofthe class described, the combination of a hammer head section having a striking face and having a throat opening in said face through which the staples are ejected, a driving member in said head movable in said throat to eject a staple therefrom and projecting it beyond the striking face, a striking plunger movable in said head in reverse direction to that of the driving member and positioned to contact the object in advance of the striking face of the head, a rocker lever in said head adapted to be actuated by the plunger, and toggle means connected with said rocker member and said driving member for actuating the driving member in a direction reverse to that of the striking plunger. 6. In a stapling hammer of the class described, the combination of a hammer head section having a striking face and having a throat opening in said face through which thestaples are ejected, a driving member in said head movable in said throat to eject a staple therefrom and projecting it beyond the striking face, a striking plunger movable in said head in reverse direction to that oi the dri-ving member and positioned to contact the object in advance o! the striking face of the head, a rocker lever in said head adapted to be actuated by the plunger, toggle means connected with said rocker member and said driving member for actuating the driving member in a direction reverse to that of the striking plunger. a handle member for said hammer head. and means within the handle for feeding staples successively to said discharge throat.

. NORRIS R. LIBERT.

REFERENCES CITED The following references are o! record inI the ille or this patent:

UNITED STATES PATENTS Number Name Date 373,265 Bloodworth Nov. 15, 1887 1,688,037 Crofoot Oct. 16, 1929 2,281,232 Cavanagh Apr. 28, 1942 2,288,500 Vogel June 80. 1942 2,811,412 Pankonin Feb. 16. 1943 2,342,818 Polzer Feb. 29. 1944 2,345,267 Keil Mar. 28, 1944 2,375,419 Kraatz May 8, 1945 

